Model Validation for Estimating Taper Microgroove Deformation During Total Hip Arthroplasty Head-neck Assembly

Overview

Journal J Biomech

Specialty Physiology

Date 2022 Jun 13

PMID 35696772

Authors

Michael Godoy

Jonathan A Gustafson

Justin S Hertzler

Jeffrey E Bischoff

Robin Pourzal

Hannah J Lundberg

Affiliations

Soon will be listed here.

Abstract

Total hip arthroplasty (THA) failure and the need for revision surgery can result from fretting-corrosion damage of the head-neck modular taper junctions. Prior work has shown that implant geometry, such as microgrooves, influences damage on retrieved implants. Microgroove deformation within the modular taper junction occurs when the female head taper meets the male stem taper during THA surgical procedure. The objective of this work was to validate microgroove deformation after head-neck THA assembly as calculated by finite element analysis (FEA). Four 28 mm CoCrMo head tapers and four Ti6Al4V stem tapers were scanned via white light interferometry. Heads were assembled onto stem tapers until 6kN reaction force was achieved, followed by head removal using a cut-off machine. The stem tapers were then rescanned and analyzed. Simultaneously, a 2D axisymmetric FEA model was developed and assembled per implant geometries and experimental data. For experiments and FEA, the mean change in microgroove height was 1.23 µm and 1.40 µm, respectively. The largest microgroove height change occurred on the proximal stem taper due to the conical angles of the head and stem tapers. FEA showed that the head-stem assembly induced high stresses and microgroove peaks flattening. 76-89% and 91-100% of the microgrooves in the experiments and FEA, respectively, showed height changes along the contact length of the stem taper. A validated FEA model of THA head-neck modular junction contact mechanics is essential to identifying implant geometries and surface topographies that can potentially minimize the risk of fretting and fretting-corrosion at modular junctions.

Citing Articles

Finite Element Analysis of Acetabulum Prosthesis' Lining Damage Zone with Different Implanting Angle.

Bian Y, Wang H, Huang A Comput Math Methods Med. 2023; 2023:9350474.

PMID: 37304323 PMC: 10256448. DOI: 10.1155/2023/9350474.

An Overview of the Stability and Fretting Corrosion of Microgrooved Necks in the Taper Junction of Hip Implants.

Feyzi M, Fallahnezhad K, Taylor M, Hashemi R Materials (Basel). 2022; 15(23).

PMID: 36499893 PMC: 9735617. DOI: 10.3390/ma15238396.

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